The injection molded parts on all the Classic Airframes kits I've built Have very fine recessed lines and good detail. They are attached to the sprues with thick runners, requiring care when removing the parts. Its easy to "chip" the part when removing it. The larger parts, such as fuselage halves, will benefit from block-sanding the the edges before committing the parts to glue. There are usually no (mis) alignment pins, and tail surfaces are butt-joints, which will attach more firmly with wire reinforcements inserted. If you use care, go slowly, and apply basic skills (dry-fitting, sanding, filling seams, etc.) they build to very nice kits. Mold separation lines are also usually present, with rod-shaped pieces being a challenge to clean & keep round.
Assembling biplanes can be tricky, especially with a liimited run kit. To assure proper allignment, an assembly jig for the wings can prevent much frustration. Biplanes are also easier to paint before attaching the top wing.
The interiors are beautifully cast in resin. Vac canopies usually include a spare.
While not a fall-together build by any means, a successful completion of one of their kits is very rewarding.